Multiple choice general knowledge World's Deepest Lake? Malawi or Nyasa, Africa Caspian sea,Asia-Europe Tanganyika,Africa Baikal,Russia Fed. Reveal answer Fill a bubble to check yourself D Correct answer Explanation Lake Baikal in southern Siberia, Russia, is the world's deepest lake at 1,642 meters (5,387 ft). It's also the world's oldest lake (25-30 million years) and largest by volume, holding about 20% of all unfrozen fresh water on Earth's surface.